GeEllipArc.h

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// Copyright (C) 2002-2022, Open Design Alliance (the "Alliance"). 
// All rights reserved. 
// 
// This software and its documentation and related materials are owned by 
// the Alliance. The software may only be incorporated into application 
// programs owned by members of the Alliance, subject to a signed 
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable  
// trade secrets of the Alliance and its suppliers. The software is also 
// protected by copyright law and international treaty provisions. Application  
// programs incorporating this software must include the following statement 
// with their copyright notices:
//   
//   This application incorporates Open Design Alliance software pursuant to a license 
//   agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2022 by Open Design Alliance. 
//   All rights reserved.
//
// By use of this software, its documentation or related materials, you 
// acknowledge and accept the above terms.
 
 
#ifndef __OD_GE_ELLIP_ARC__
#define __OD_GE_ELLIP_ARC__
 
#include "OdRound.h"
 
namespace OdGeEllipArc 
{  
  inline double calibrateAngle(double val, double input)
  {
    if (input > val)
    {
      if ((input - val) < OdaPI)
        return val;
      else
        return val + OdRound((input - val) / Oda2PI) * Oda2PI;
    }
    else
    {
      if ((val - input) < OdaPI)
        return val;
      else
        return val - OdRound((val - input) / Oda2PI) * Oda2PI;
    }
  }
 
  inline double angleFromParam(
    double param,
    double radiusRatio)
  {
    if (OdZero(param, 1e-7))
      return 0;
    if (OdZero(param - Oda2PI, 1e-7))
      return Oda2PI;
 
    return calibrateAngle(OD_ATAN2(radiusRatio * sin(param), cos(param)), param);
  }
  
  inline double paramFromAngle(
    double angle,
    double radiusRatio)
  {
    if (OdZero(angle, 1e-12))
      return 0;
    if (OdZero(angle - Oda2PI, 1e-12))
      return Oda2PI;
 
    return calibrateAngle(OD_ATAN2(sin(angle), radiusRatio * cos(angle)), angle);
  }
}
 
#endif // __OD_GE_ELLIP_ARC__